Abstract

Background: The interpretation of data obtained in a movement analysis laboratory is a crucial
issue in clinical contexts. Collection of such data in large databases might encourage the use of
modern techniques of data mining to discover additional knowledge with automated methods. In
order to maximise the size of the database, simple and low-cost experimental set-ups are
preferable. The aim of this study was to extract knowledge inherent in the sit-to-stand task as
performed by healthy adults, by searching relationships among measured and estimated
biomechanical quantities. An automated method was applied to a large amount of data stored in a
database. The sit-to-stand motor task was already shown to be adequate for determining the level
of individual motor ability.
Methods: The technique of search for association rules was chosen to discover patterns as part
of a Knowledge Discovery in Databases (KDD) process applied to a sit-to-stand motor task
observed with a simple experimental set-up and analysed by means of a minimum measured input
model. Selected parameters and variables of a database containing data from 110 healthy adults, of
both genders and of a large range of age, performing the task were considered in the analysis.
Results: A set of rules and definitions were found characterising the patterns shared by the
investigated subjects. Time events of the task turned out to be highly interdependent at least in
their average values, showing a high level of repeatability of the timing of the performance of the
task.
Conclusions: The distinctive patterns of the sit-to-stand task found in this study, associated to
those that could be found in similar studies focusing on subjects with pathologies, could be used as
a reference for the functional evaluation of specific subjects performing the sit-to-stand motor task.